Help! This is for an exposition... The heavy metal was born late 1960's in the united kingdom and the USA. Then the genre evolved and splintered into many different styles and subgenres, like nu metal (Linkin Park, Evanescence), alternative metal (Avenged sevenfold, Nickelback), and many other. The heavy metal includes a group of related styles that are intense, virtuosic, and powerful. Driven by the aggressive sounds of the distorted electric guitar, heavy metal is arguably the most commercially successful genre of rock music.